Tilly has intrusive thoughts about harming her family. Disturbed by the thoughts, she hides them, finding her own ways to keep these thoughts at bay. When her sister Grace returns home, Tilly eventually has to tell her whats been going on. "I'm Just a Little Bit OCD'' is a play told through episodic scenes of sisters, Tilly and Grace, as they come to terms with Tillys new reality. At the same time, brutal truthful, comedic monologues are performed by Matilda, a podcaster and OCD advocate.